4 speed identification

It's obvious by looking at the gears with the cover off its an overdrive. There's almost no way the original poster can tell that the synchros are good by looking at the outside of them. If it was me I'd try and get $200 for it and start with one much better than that. you'll be into it damn near as much as it would cost to buy a new one from Brewers or rebuilt one. Oh yeah, and still have an overdrive. But if you do decide to rebuild it you will get a free education.